Students cannot see the course

I already have this problem, and was solved, but now it happened again: The same problem Happen again! I deleted that Test Course, and created a new one from zero! Again the same erro happen, no one can see the course! I tried to unpublish, i click there, when i reload the page it is checked as published... I can't unpublished the course.. to re publish like you said it works! what should i Do?

the other post was: